Drive Belt Tensioner Idler Pulley For BMW E36 E46 325i 328i E39 525i 528i X5 E53 Z4 E85 For M52 M54 S50 S52 S54 engines. For BMW 5 Series E39 520i 523i 525i 528i 530i 1998-2003. For BMW 3 Series E46 320i 323i 325i 325xi 328i 330i 330xi 1998-2005.